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Interface FileObject

All Known Subinterfaces:: JavaFileObject

All Known Implementing Classes:: ForwardingFileObject, ForwardingJavaFileObject, SimpleJavaFileObject

public interface FileObject

File abstraction for tools. In this context, file means an abstraction of regular files and other sources of data. For example, a file object can be used to represent regular files, memory cache, or data in databases.

All methods in this interface might throw a SecurityException if a security exception occurs.

Unless explicitly allowed, all methods in this interface might throw a NullPointerException if given a null argument.

Since:: 1.6

Method Summary

Modifier and Type	Method	Description
`boolean`	`delete()`	Deletes this file object.
`CharSequence`	`getCharContent(boolean ignoreEncodingErrors)`	Returns the character content of this file object, if available.
`long`	`getLastModified()`	Returns the time this file object was last modified.
`String`	`getName()`	Returns a user-friendly name for this file object.
`InputStream`	`openInputStream()`	Returns an InputStream for this file object.
`OutputStream`	`openOutputStream()`	Returns an OutputStream for this file object.
`Reader`	`openReader(boolean ignoreEncodingErrors)`	Returns a reader for this object.
`Writer`	`openWriter()`	Returns a Writer for this file object.
`URI`	`toUri()`	Returns a URI identifying this file object.

Method Details

toUri

URI toUri()

Returns a URI identifying this file object.

Returns:: a URI

getName

String getName()

Returns a user-friendly name for this file object. The exact value returned is not specified but implementations should take care to preserve names as given by the user. For example, if the user writes the filename "BobsApp\Test.java" on the command line, this method should return


 "BobsApp\Test.java"

whereas the toUri method might return


 file:///C:/Documents%20and%20Settings/UncleBob/BobsApp/Test.java

Returns:: a user-friendly name

openInputStream

InputStream openInputStream() throws IOException

Returns an InputStream for this file object.

Returns:: an InputStream
Throws:: IllegalStateException - if this file object was opened for writing and does not support reading; UnsupportedOperationException - if this kind of file object does not support byte access; IOException - if an I/O error occurred

openOutputStream

OutputStream openOutputStream() throws IOException

Returns an OutputStream for this file object.

Returns:: an OutputStream
Throws:: IllegalStateException - if this file object was opened for reading and does not support writing; UnsupportedOperationException - if this kind of file object does not support byte access; IOException - if an I/O error occurred

openReader

Reader openReader(boolean ignoreEncodingErrors) throws IOException

Returns a reader for this object. The returned reader will replace bytes that cannot be decoded with the default translation character. In addition, the reader may report a diagnostic unless ignoreEncodingErrors is true.

Parameters:: ignoreEncodingErrors - ignore encoding errors if true
Returns:: a Reader
Throws:: IllegalStateException - if this file object was opened for writing and does not support reading; UnsupportedOperationException - if this kind of file object does not support character access; IOException - if an I/O error occurred

getCharContent

CharSequence getCharContent(boolean ignoreEncodingErrors) throws IOException

Returns the character content of this file object, if available. Any byte that cannot be decoded will be replaced by the default translation character. In addition, a diagnostic may be reported unless ignoreEncodingErrors is true.

Parameters:: ignoreEncodingErrors - ignore encoding errors if true
Returns:: a CharSequence if available; null otherwise
Throws:: IllegalStateException - if this file object was opened for writing and does not support reading; UnsupportedOperationException - if this kind of file object does not support character access; IOException - if an I/O error occurred

openWriter

Writer openWriter() throws IOException

Returns a Writer for this file object.

Returns:: a Writer
Throws:: IllegalStateException - if this file object was opened for reading and does not support writing; UnsupportedOperationException - if this kind of file object does not support character access; IOException - if an I/O error occurred

getLastModified

long getLastModified()

Returns the time this file object was last modified. The time is measured in milliseconds since the epoch (00:00:00 GMT, January 1, 1970).

Returns:: the time this file object was last modified; or 0 if the file object does not exist, if an I/O error occurred, or if the operation is not supported

delete

boolean delete()

Deletes this file object. In case of errors, returns false.

Returns:: true if and only if this file object is successfully deleted; false otherwise

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Documentation extracted from Debian's OpenJDK Development Kit package.
Licensed under the GNU General Public License, version 2, with the Classpath Exception.
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https://docs.oracle.com/en/java/javase/21/docs/api/java.compiler/javax/tools/FileObject.html